摘要
宝兴沟金矿床为一产于上黑龙江盆地南缘二十二站组砂岩内的大型金矿床。金矿化与闪长岩、闪长玢岩具有密切的生成关系，矿体产于二十二站组砂岩与脉岩内外接触带附近，金属矿物主要有黄铁矿、方铅矿、闪锌矿、黄铜矿、毒砂等，其中黄铁矿、毒砂与金矿化关系密切。按矿物组合不同，其成矿作用可划分为浸染状黄铁矿-石英阶段、黄铁矿±毒砂－石英阶段、多金属硫化物－石英阶段、少硫化物一碳酸盐阶段。流体包裹体研究表明，主成矿多金属硫化物－石英阶段石英中发育有气液二相包裹体及少量含NaCl子矿物三相包裹体，均一温度变化范围为266．9～319．6℃，峰值为280～300qC，盐度为7．44％～14．84％，成矿流体为中温、中-高盐度NaCl-H，O热液体系，以岩浆热液为主；经估算流体捕获压力为27．16—35．88MPa，推算成矿深度约为0．88。1．2km。综合分析认为，宝兴沟金矿床是与浅成侵入体密切相关的中浅成、中温热液矿床。
Located in sandstones of Ershierzhan formation on the southern margin of upper Heilongjiang Foreland Basin, Baoxinggou gold deposit is a large scale gold deposit. Mineralization is closely related to diorite and diorite-por- phyrite, orebodies occur in the outer and inner contact zones of shallow intrusive rocks and sandstone formation, the metallic minerals mainly consist of pyrite, galena, sphalerite, chalcopyrite and arsenopyrite, of which pyrite and arseno- pyrite were closely related to gold mineralization. Based on different mineral assemblages, the mineralization can be classified into four stages, namely disseminated pyrite-quartz, pyrite ± arsenopyrite-quartz, polymetallic sulfides-quartz and sulfide-poor-carbonate phases. Fluid inclusion study showed that there are halite-bearing three-phase and aqueous two-phase fluid inclusions developed in polymetallic sulfides-quartz mineralization stage, homogenization temperature ranges from 266.9 ℃ to 319.6 ℃ with the peak value between 280 % and 300 ℃ ,salinity varies from 7.44 % to 14.84 % with the ore-forming fluids correspondingly of medium temperature,while NaC1-H20 type hydrothermal solutions with medium to high salinity mainly came from magmatic water. The estimated fluid - trapping pressures are 27. 16 -35.88 MPa,corresponding depth of 0. 8 -1.2 kin. Through comprehensive analysis,the author thinks the genetic type of Baoxinggou Gold Deposit is moderate-shallow depth and medium temperature epithermal ore deposit and gold mineralization is closely related to shallow intrusive rock.
出处
《黄金》
CAS
2014年第4期19-25,共7页
Gold
基金
武警黄金指挥部黄金地质工作专项业务费项目(2008-20130302)
关键词
地质特征
流体包裹体
宝兴沟金矿床
黑龙江塔河
geological characteristics
fluid inclusion
Baoxinggou Gold Deposit
Tahe County, Heilongjiang Province
